Key technologies and applications of 3D terrain modeling for landslide simulations

doi:10.13474/j.cnki.11-2246.2023.0319

Abstract

Abstract: High-resolution landslide terrain data is an important guarantee for the accuracy and visualization effect of landslide simulations. However, rendering all high-resolution landslide terrain data will cause the landslide simulation program to run slowly, managing terrain data hierarchically and loading terrain data blocks into memory in batches for combined rendering will lead to discontinuity and inconsistent resolution of terrain data participating in landslide simulation calculations. To solve the above problems, an improved quadtree LoD terrain modeling method for landslide simulations is proposed in this paper. Based on this method, terrain data is completely read into memory for numerical calculations, and terrain data blocks of different resolutions are dynamically constructed from the terrain data for combined rendering during the visualization stage, which not only provides complete and continuous terrain conditions for landslide simulations, but also ensures 3D visualization effect of landslide terrain, and effectively improves the running speed of simulation programs. More importantly, by using this method for modeling, the results of landslide simulation will not be affected when browsing the simulation scenes during the landslide simulation processes. The experimental results of landslide simulation show that the method proposed in this paper is effective and practical in 3D terrain optimization modeling for landslide simulations.

Key words: landslide simulation, terrain modeling, quadtree, level of detail (LoD), 3D visualization

CLC Number:

P237

LÜ Yijie, YE Jian. Key technologies and applications of 3D terrain modeling for landslide simulations[J]. Bulletin of Surveying and Mapping, 2023, 0(11): 7-11,17.

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